Scrub your kids clean or let them eat dirt? Brooke discovers if our obsession with cleanliness is the real reason behind asthma and allergies. Dr Andrew takes a look at the serious business of high blood pressure and how to avoid it. Leila risks it all to see if it’s safe to talk on the phone during a thunderstorm and the team looks at whether Aussie blokes’ love for beer can affect their performance in the bedroom. And Slats sets out to see if aromatherapy really works.